British Standard Fine-- fijne stap -- BSF

	British Thread (British Standard Fine) -- Fine Pitch
	Nominal Size BSF	Thread Form Type	Major Diameter mm d=D	Pitch mm p	Threads per inch tpi	Pitch Diameter mm d2=D2	Minor Diameter Male Thd. d3	Thread Height H1	Tap Drill Diameter mm
	3/16"	BSF	4.763	0.794	32	4.255	3.747	0.508	4.00
	7/32"	BSF	5.556	0.907	28	4.975	4.394	0.581	4.60
	1/4"	BSF	6.350	0.977	26	5.725	5.100	0.625	5.30
	9/32"	BSF	7.142	0.977	26	6.518	5.893	0.625	6.10
	5/16"	BSF	7.938	1.156	22	7.199	6.459	0.739	6.80
	3/8"	BSF	9.525	1.27	20	8.712	7.899	0.813	8.30
	7/16"	BSF	11.113	1.411	18	10.209	9.304	0.904	9.70
	1/2"	BSF	12.700	1.588	16	11.684	10.668	1.017	11.10
	9/16"	BSF	14.288	1.588	16	13.272	12.256	1.017	12.70
	5/8"	BSF	15.875	1.814	14	14.712	13.549	1.162	14.00
	11/16"	BSF	17.463	1.814	14	16.300	15.137	1.162	15.50
	3/4"	BSF	19.050	2.117	12	17.693	16.336	1.355	16.75
	13/16"	BSF	20.638	2.117	12	19.281	17.924	1.355	18.25
	7/8"	BSF	22.225	2.309	11	20.747	19.269	1.479	19.75
	1"	BSF	25.400	2.54	10	23.774	22.148	1.627	22.75
	1 1/8"	BSF	28.575	2.822	9	26.769	24.963	1.807	26.50
	1 1/4"	BSF	31.750	2.822	9	29.944	28.138	1.807	28.75
	1 3/8"	BSF	34.925	3.175	8	32.893	30.861	2.033	31.50
	1 1/2"	BSF	38.100	3.175	8	36.068	34.036	2.033	34.50
	1 5/8"	BSF	41.275	3.175	8	39.243	37.211	2.033	38.00
	1 3/4"	BSF	44.450	3.629	7	42.126	39.802	2.324	40.50
	2"	BSF	50.800	3.629	7	48.476	46.152	2.324	47.00
	2 1/4"	BSF	57.150	4.234	6	54.440	51.730	2.711	53.00
	2 1/2"	BSF	63.500	4.234	6	60.790	58.080	2.711	59.00
	2 3/4"	BSF	69.850	4.234	6	67.140	64.430	2.711	n/a
	3"	BSF	76.200	5.08	5	72.946	69.692	3.253	n/a
	3 1/4"	BSF	82.550	5.08	5	79.296	76.042	3.253	n/a
	3 1/2"	BSF	88.900	5.645	4 1/2	85.285	81.670	3.614	n/a
	3 3/4"	BSF	95.250	5.645	4 1/2	91.635	88.020	3.614	n/a
	4"	BSF	101.600	5.645	4 1/2	97.985	94.370	3.614	n/a
	4 1/4"	BSF	107.950	6.35	4	103.886	99.822	4.066	n/a